package com.zhejiangzhengyuan.municipal_common.utils.LED;


import lombok.extern.slf4j.Slf4j;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.net.URI;
import java.util.*;

@Slf4j
public class HttpClientUtils {


    /**
     * GET 请求  带参数
     *
     * @param url
     * @param param
     * @return
     */
    public static String doGet(String url, Map<String, String> param) {
        // 创建Httpclient对象
        CloseableHttpClient httpclient = HttpClients.createDefault();
        String resultString = "";
        CloseableHttpResponse response = null;
        try {
            // 创建uri
            URIBuilder builder = new URIBuilder(url);
            if (param != null) {
                for (String key : param.keySet()) {
                    builder.addParameter(key, param.get(key));
                }
            }
            URI uri = builder.build();
            // 创建http GET请求
            HttpGet httpGet = new HttpGet(uri);
            // 执行请求
            response = httpclient.execute(httpGet);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
                httpclient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultString;
    }


    /**
     * GET 请求  不带参数
     *
     * @param url
     * @return
     */
    public static String doGet(String url) {
        return doGet(url, null);
    }


    /**
     *
     * POST  带参数
     *
     * @param url
     * @param params
     * @return
     */
    public static CloseableHttpResponse doPost(String url, Map<String, String> params) {
        List<NameValuePair> pairs = generatePairs(params);
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        CloseableHttpResponse response = null;
        try {
            HttpPost httpPost = new HttpPost(url);
            RequestConfig requestConfig = RequestConfig.custom()
                    .setSocketTimeout(3000) //服务器响应超时时间
                    .setConnectTimeout(3000) //连接服务器超时时间
                    .build();
            httpPost.setConfig(requestConfig);
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs, "utf-8");
            httpPost.setEntity(entity);
            httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded");
            response = httpClient.execute(httpPost); //todo 由客户端执行(发送)请求
            log.info("响应状态为:" + response.getStatusLine());
            // HttpEntity responseEntity = response.getEntity();//todo  从响应模型中获取响应实体
            return response;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 释放资源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            return response;
        }
    }


    /**
     *  解析参数
     * @param params
     * @return
     */
    private static List<NameValuePair> generatePairs(Map<String, String> params) {
        if (params == null || params.size() == 0) {
            return Collections.emptyList();
        }
        List<NameValuePair> pairs = new ArrayList<>();
        for (Map.Entry<String,String> entry : params.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            if (key == null) {
                continue;
            }
            pairs.add(new BasicNameValuePair(key, value));
        }
        return pairs;
    }


    /**
     * POST  不带参数
     *
     * @param url
     * @return
     */
    public static CloseableHttpResponse doPost(String url) {
        return doPost(url, null);
    }


    /**
     *
     * POST  参数为json类型
     *
     * @param url
     * @param json
     * @return
     */
    public static String doPostJson(String url, String json) {
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultString = "";
        try {
            // 创建Http Post请求
            HttpPost httpPost = new HttpPost(url);
            // 创建请求内容
            StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
            httpPost.setEntity(entity);
            // 执行http请求
            response = httpClient.execute(httpPost);
            resultString = EntityUtils.toString(response.getEntity(), "utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                response.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return resultString;
    }


    public static void main(String[] args) {

        Map<String, String> param = new HashMap<String, String>();
        param.put("username", "xiaoming");
        String url = "http://127.0.0.1:8080/TestDemo/httpClientResp";
        String str = HttpClientUtils.doGet(url, param);
        System.out.println(str);
    }
}
